Android：Facebook失败的Firebase身份验证

我正在尝试使用Firebase来处理Facebook登录身份验证 . 我已经按照Firebase和Facebook网站上的文档创建了活动，并确保根据需要填充两个站点上的设置 .

我可以从我的应用程序登录到Facebook，但是当Firebase保存用户时，我收到一个错误：

signInWithCredential com.google.firebase.FirebaseException：发生内部错误 . [未配置访问权限 . 之前或已禁用Google Identity Toolkit API尚未在项目27973105972中使用 . 通过访问https启用它

在Firebase上我有登录提供商：Facebook启用了正确的应用程序ID和应用程序机密 .

在Facebook上，我已将Firebase的重定向URI添加到Valid OAuth重定向URI列表中 .

请注意，搜索Google Identity Toolkit API会引导我使用https://developers.google.com/identity/toolkit/来说明使用Firebase身份验证 . 所以不是一个非常有用的错误消息 .

import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.Toast;

import com.facebook.AccessToken;
import com.facebook.CallbackManager;
import com.facebook.FacebookCallback;
import com.facebook.FacebookException;
import com.facebook.login.LoginResult;
import com.facebook.login.widget.LoginButton;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthCredential;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FacebookAuthProvider;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;

public class MainActivity extends AppCompatActivity {

    private static final String TAG = MainActivity.class.getSimpleName();

    private CallbackManager mCallbackManager;

    private FirebaseAuth mAuth;

    private FirebaseAuth.AuthStateListener mAuthListener;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Initialize Firebase Auth
        mAuth = FirebaseAuth.getInstance();

        // [START auth_state_listener]
        mAuthListener = new FirebaseAuth.AuthStateListener() {
            @Override
            public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
                FirebaseUser user = firebaseAuth.getCurrentUser();
                if (user != null) {
                    // User is signed in
                    Log.d(TAG, "onAuthStateChanged:signed_in:" + user.getUid());
                    Toast.makeText(MainActivity.this, "Authentication successful 2.",
                            Toast.LENGTH_SHORT).show();
                } else {
                    // User is signed out
                    Log.d(TAG, "onAuthStateChanged:signed_out");
                    Toast.makeText(MainActivity.this, "Authentication signed out.",
                            Toast.LENGTH_SHORT).show();
                }
                // ...
            }
        };
        // [END auth_state_listener]

        // Initialize Facebook Login button
        mCallbackManager = CallbackManager.Factory.create();
        LoginButton loginButton = (LoginButton) findViewById(R.id.login_button);
        loginButton.setReadPermissions("email", "public_profile");
        loginButton.registerCallback(mCallbackManager, new FacebookCallback<LoginResult>() {
            @Override
            public void onSuccess(LoginResult loginResult) {
                Log.d(TAG, "facebook:onSuccess:" + loginResult);
                handleFacebookAccessToken(loginResult.getAccessToken());
            }

            @Override
            public void onCancel() {
                Log.d(TAG, "facebook:onCancel");
                Toast.makeText(MainActivity.this, "facebook onCancel",
                        Toast.LENGTH_SHORT).show();
                // ...
            }

            @Override
            public void onError(FacebookException error) {
                Log.d(TAG, "facebook:onError", error);
                Toast.makeText(MainActivity.this, "facebook onError",
                        Toast.LENGTH_SHORT).show();
                // ...
            }
        });
        // [END initialize_fblogin]
    }

    @Override
    public void onStart() {
        super.onStart();
        // [START on_start_add_listener]
        mAuth.addAuthStateListener(mAuthListener);
    }

    @Override
    public void onStop() {
        super.onStop();
        // [START on_stop_remove_listener]
        if (mAuthListener != null) {
            mAuth.removeAuthStateListener(mAuthListener);
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        // Pass the activity result back to the Facebook SDK
        mCallbackManager.onActivityResult(requestCode, resultCode, data);
    }

    // [START auth_with_facebook]
    private void handleFacebookAccessToken(AccessToken token) {
        Log.d(TAG, "handleFacebookAccessToken:" + token);

        AuthCredential credential = FacebookAuthProvider.getCredential(token.getToken());

        mAuth.signInWithCredential(credential)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        Log.d(TAG, "signInWithCredential:onComplete:" + task.isSuccessful());

                        // If sign in fails, display a message to the user. If sign in succeeds
                        // the auth state listener will be notified and logic to handle the
                        // signed in user can be handled in the listener.
                        if (!task.isSuccessful()) {
                            Log.w(TAG, "signInWithCredential", task.getException());
                            Toast.makeText(MainActivity.this, "Authentication failed.",
                                    Toast.LENGTH_SHORT).show();
                        } else {
                            Toast.makeText(MainActivity.this, "Authentication successful.",
                                    Toast.LENGTH_SHORT).show();
                        }

                        // ...
                    }
                });
    }
}